Home
Class 12
BIOLOGY
[A]: Phytotron is a device by which phot...

[A]: Phytotron is a device by which photolysis of water is created.
[R]: Phytotron is a method of keeping plants in natural light and temperature in houses

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • Plant Morphology & Reproduction

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|62 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATIONS

    TRUEMAN BIOLOGY|Exercise MCQs|343 Videos

Similar Questions

Explore conceptually related problems

[A] : There is a chemical warfare amongst some plants . [R] : The roots or decomposing litter exudates some toxic materials which keep the other plants out of its sphere of influence .

A plant in your garden avoids photorespiratory losses, has improved water use efficiency shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the followubg physiological groups would you assign this plant

Write a short note on : (a) Adaptations of desert plants and animals (b) Adaptations of plants to water scarcity (c) Behavioural adaptations in animals (d) Importance of light to plants (e) Effect of temperature or water scarcity and the adaptations of animals.

The volume and mass of a buoy are 1000 L and 950 kg respectively. It is anchored to the bottom of the sea with a light chain which keeps it floating inside the water. The specific gravity of sea water is 1.02. What is the tension in the chain?

A point source of light is kept at a depth of 'h' in water of r.i 4/3. The radius of the circle at the surface of water through which light emits is

FoIIowing is a Iist of some fectors which couId possibIy infIuece the speed of wave propagation. (i) Nature of source (ii) direction of propagation (iii) motion of the source and / or observeer (iv) wavelength , (v) intensity of the wave. One which of these factors if any does the speed of light in any medium like glass or water depend?

In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants systhesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. A piece of wood from an archeological source shows a C-14 activity which is 60% of the activity found in fresh wood today. The age of archeological sample will be:

You have brought a rose twig your friend's house and planted it in you garden? Discuss the method you have adopted and why? How will you differentiate between the cell division of a somatic cell and a reproductive mother cell on the basis of- nature of chromosome division

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Phytotron is a device by which photolysis of water is created. ...

    Text Solution

    |

  2. [A]: The driving force for passive absorption is non metabolic in orig...

    Text Solution

    |

  3. [A]: The movement of ions from endodermis to xylem elements is an acti...

    Text Solution

    |

  4. [A]: The water molecules are held together from cells of leaf to root ...

    Text Solution

    |

  5. [A]: Passive absorption of a substance oc- curs from its lower to high...

    Text Solution

    |

  6. [A]: Xylem transports sap from root to shoot. [R]: Phloem transloca...

    Text Solution

    |

  7. [A]: Maximum transpiration occurs in meso- phytes than xerophytes. ...

    Text Solution

    |

  8. Assertion : Thick cuticle is mostly present in disease resistant pla...

    Text Solution

    |

  9. Assertion. Submerged plants get carbon dioxide in the form of carbona...

    Text Solution

    |

  10. [A]: Phloem is the main conducting tissue. [R]: Phloem does the· fu...

    Text Solution

    |

  11. [A]: Antitranspirants are used to retard tran- spiration. [R]: AbA ...

    Text Solution

    |

  12. [A]: Rate of transpiration is high in low wind velocity. [R]: Wind r...

    Text Solution

    |

  13. [A]: The rate of transpiration is indirectly pro- portional to RH. [...

    Text Solution

    |

  14. [A]: High pH in guard cells activate phosphorylase to convert starch i...

    Text Solution

    |

  15. [A]: Daily periodicity of stomata movement is not the characteristic o...

    Text Solution

    |

  16. [A]: In Nepenthes, lamina is modified to cap- ture insects to get nitr...

    Text Solution

    |

  17. [A]: The downward· movement of minerals through soil is effected by qu...

    Text Solution

    |

  18. [A]: Auxins are found in large amounts in the apical Meristem of shoot...

    Text Solution

    |

  19. [A]: In C4 plants, CO2 fixation occurs at three sites. [R]: CO2 is f...

    Text Solution

    |

  20. [A]: Oxidation of H2O takes place during pho- tosynthesis. [R]: Ph...

    Text Solution

    |